Stratix V Advanced Systems Development Kit SW4 Default Settings

I would say, there is strange behavior of all parties.

Those boards were bought by customer "H". Both Altera and Terasic got paid for it.

"H" decided to sell the boards, and new owners have questions about using the hardware they purchased.

No warranty or software licensing issue have risen, but a request for tech docs for the hardware Terasic manufactured, sold and get paid for.

If you made any changes (significant or not), it can't be done without proper documentation.